CMM at the end of the pipeline + sparse code refactoring
A new BPC checkbutton has been created in 'Preferences/Color Management'
and in the ICM tool. Better hanbling of widget sensitivity of the output
profile / gamma part of the ICM tool.
- Removed the "Rendering intent" setting from Preferences,
- Hard-code "relative colorimetric" intent everywhere,
- Filter through output profile before filtering through monitor
profile if using a monitor profile,
- If not using a monitor profile, a direct sRGB conversion is done,
